I have no doubt that he has the small penis/Napoleon complex.
He's not just a little megalomaniac, he will change the results of his own "focus groups" to cater to whatever network he is on at the moment. I saw it in the'12 election w/Romney v. Obama debates. On Fox it's one result, on the Today show it was entirely different.
Ouch! All I would add is that he’s bald, too, and is too cheap to buy a good toup.